In reply to fob.

@fob, Yes I know about SVGs. I use them about 90% of the time for this reason.

But I don't buy your idea that adaptive rasterized images are more "professional" then responsive ones. At best, all you're saying is that WordPress doesn't have a good way of automatically making Retina-friendly versions of images, so we're settling for the moment on having more versions of images than we currently do.

That might be pragmatic in the light of what WordPress is capable of. But it's messy and far from optimal.